Error with symbolic summation of complex matrixes

Hi,

I have an issue with a symbolic summation of complex matrices..

In particular, I have defined two matrixes in a symbolic way:

A=(exp(1i*norm(r))./(norm(r).^3)).*(((1-1i*norm(r))./(norm(r).^2))

B=(exp(1i*norm(r))./norm(r).^3).*((cross(r,cross(p,r))));

A and B are 3x1 complex matrixes.

If I perform summation in a symbolic way C=plus(A,B); and then replace symbols by numbers the result is wrong...

Contrary to that, if I calculate it in numbers, first A and then B, and then sum up them - the result is correct...

Does anyone face with such kind of problem? What is wrong with the "plus" operator when I do it in a symbolic way?

Thank you!